Grinding-machine.



No. 686,820. Patented Nov. 19, 190:.

' J. MACPHAIL.

GRINDING MACHINE.

(Application filed Apr. 24, 1900.)

3 Shuets$heet I.

(N0 Model.)

\/\/1 L sssss phW gm/X 'No. 686,820. Patented Nov. I9, I90].

J. MACPHAIL.

GRINDING MACHINE.

(Application filed. Apr. 24, 1900.) (No Model.) 3 Sheets- Shaet 2.

No. 686,820. Patantod Nov. [9, I901.

J. MACPHAIL. I

GRINDING MACHINE.

(Application filed Apr. 24, 1900.)

(No Model.) 3 Shear-Sheet 3.

m: Norms PETERS ca, Pumau'mu, WASHINGTON, u c

. UNiriEn STATES ATENT ()FFICE.

GRINDING- MACHINE.

SPECIFICATION forming part of Letters Patent No. 686,820, dated November 19, 1901.

" llpplication filed April 24, 1900. Serial No. 14,200. (No model.)

To all whom it may concern:

Be it known thatl, JAMES MACPHAIL, a citizen of the UnitedStates of America, residing at Blue Island, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Grinding-Machines, of which the following is a specification.

My invention relates to grindingmachines; and its object is the production of machines adapted not only for grinding harrow-disks and the like, but also for grinding harvesterknives and miscellaneous articles.

My machine embodies novel construct-ion, adjustment of parts, and mode of operation.

Referring to the accompanying drawings, which form a part of this specification, Figure 1 is a top plan view of a grinding-machine embodying my invention. Fig. 2 is a side elevation of the same. Fig. 3 is a front end elevation also of the same. -Fig. 4 is a vertical section on the line 4 4 in Fig. l of parts there shown. Fig. 5 is a vertical section on the line 5 5 in Fig. 6 of parts there shown. Fig. 6 is a vertical section on the line 6 6 in Fig. 5 of parts there shown. Figs. 7 and S are top and side views, respectively, of a swiveled holder for supporting barrow-disks while they are being ground. Figs. 9 to 11, inclusive, are top plan views of harrow-disks, showing thereon difierent styles of grinding, such differences being due to the varying angles at which they are presented to the grinding-wheel, (indicated by dotted lines.)

Like letters of reference indicate corresponding parts throughout the several views.

A is a fragment of one of the wheels of a disk harrow.

B is the main frame of the grinder, which may be secured to the wheel A by means of the integral downwardly and inwardly turn ed lugs B thereon and the clamping hook-bolt B and set-nut B B is a horizontal arm integral with the frame B and having a bearing B in the fre end thereof.

G is a vibratory frame, pivot-jointed by one end 0 by means of a stud-bearing O to the horizontal portion B of the frame 13.

D is a grinding-wheel composed of corundum, emery, or similar material mounted by means of the shaft D and bearings D in the vibratory frame 0 near the free end thereof.

D is a pinion fast to the grinder-shaft D.

E is a bell-crank pivotally mounted at its angle E on the stud-bearingC the horizontal arm E thereof lapping by and extending along substantially parallel with the pivoted end portionG of the frame 0 and the free end of vertical arm E thereof terminating in a bifurcation E E is an upwardly-opening slot in the horizontal arm E of the bell-crank E, registering with an opening E in the frame 0.

F F are an integral or rigidly-connected gear and eccentric concentrically mounted on a stud-bearing F on the frame B in such position that the eccentric F sets into and contacts the bifurcation E in the vertical arm E of the bell-crank E.

G G are a gear-wheel and pinion, concentric and integral or rigidly connected, mounted concentrically with the vibratory frame 0 and bell-crank E on the stud-bearing C the former, G, meshing with the pinion I) on the grinding-wheel shaft D and the latter, G, meshing with the gear F of the gear and eccentric F F.

H is a grinding-wheel,of corundum, emery, or any desired material, mounted, by means of a shaft H and a bearing B in the horizontal arm B of the frame B.

H is a pinion fast to the shaft 11 and meshing with the gear-wheel G.

I is a barrow-disk holder, having a diskcarrying roller I mounted at and projecting above the apex 1 thereof, provided with any suitable axis 1 whereon a disk being ground may be turned and swiveled in any desired manner, as by means of a bolt and nut I I to the main frame B of the grinder.

J is a spring for holding the grinding-wheel D, through the vibratory frame 0, into contact with the harrow disk J while the edge J 2 of the latter is being sharpened by the rotations of grinding-wheel D.

My machine is operated to grind a harrowdisk J as follows: Rotate the grinding-wheel D by turning the gear wheel G, pressing the fingers and thumb of the left handdown upon the upper face of the disk at the point indicated by X, Fig. 3. Such pressure will prevent the disk from turning on the axis 1 and roller 1. Diminish the pressure thereupon when the edge J 2 of the disk has been ground sufficiently at one point, whereupon the friction of the grindingwheel D will turn the disk a short distance on its axis 1 and roller I, in fact until the hand-pressure thereupon is increased sufiiciently to again stop the turning of the disk. The above-described operations should be continued until the edge of the disk is ground to the requisite sharpness, and it will be found that such grinding can be expeditiously and satisfactorily accomplished by means of this machine. When a thin disk edge is required, the holder I and disk J should be placed in the relation to the grinding-wheel D shown in Figs. 1 and 3. If a thick, disk edge is desired, the holder I should be turned on its swivel-joint I until it is at right angles to the grindingwheel shaft D, Fig. 11, and the axis I adjusted by moving it inward to bring the edge of the disk into proper relation to the grinding-wheel D. Obviously if the holder I is so turned on its swivel-joint I as to cause the edge J of the disk J to be presented obliquely to the grinding-wheel D, Fig. 10, the edge J thereof will be ground to a medium thinness.

Whenever it is desirable to have the grinding-wheel D vibrate vertically-as when it is employed, forinstance, in grinding the triangular sections of harvester-knives-in addition to revolving, a bolt (indicated by dotted lines, Fig. 1) is inserted through the upwardly-opening slot E of the horizontal arm E of the bell-crank E and the opening E, Fig. 2, in the vibratory frame 0 and secures the same rigidly together.

A good deal of difiiculty has been experienced heretofore in securing grinding-machines to the treads of the wheels of harvesting and other machines in such a manner that they would not work loose and rock while in use, grinding barrow-disks, harvesterknives, 85c. By forming the base of the grinder as shown in the drawings and providing it with the downwardly and inwardly turnedlugs B and by employing therewith the hook-bolt B to clamp it to the wheel A, I have completely obviated this difficulty.

I claim- 1. In a grinding-machine, in combination, a main frame, a vibratory frame pivot-jointed, by one end, to a bearing on the main frame, and carrying a rotatable grinding-wheel mounted therein near the free end thereof, a bell-crank pivotally mounted, at its angle, also on the bearing of the vibratory frame, the horizontal arm thereof lapping by, and extending along substantially parallel with,

the pivoted end portion of the vibratory frame, and the free end of the vertical arm thereof terminating in a bifurcation, means for securing the bellcrank and vibratory frame rigidly together, an integral or rigidlyconnected gear and eccentric, concentrically mounted, on the main frame, in such position that the eccentric contacts the bifurcation of the vertical arm of the bell-crank, a gearwheel and pinion, concentric and integral, or rigidly connected, mounted concentrically with the vibratory frame and bell-crank, the former meshing with a pinion on the grinding-wheel shaft and the latter meshing with the gear of the gear and eccentric, substantially as and for the purpose specified.

2. In a grinding-machine, in combination, a main frame, a barrow-disk holder having a disk-carrying roller mounted at, and projecting above, the apex thereof, and provided with an axis whereon a disk, being ground, may be turned, and swiveled, by one end, to the main frame, substantially as and for the purpose specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAMES MAOPHAIL.

Witnesses:

E. O. SEMPLE, S. E. DARBY. 

